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Chemistry
A Level

Explain how the electron pair repulsion theory can be used to deduce the shape of, and the bond angle in, NH3.

Nitrogen has 5 valence electrons in its outer shell. Each Hydrogen has 1 valence electron in its outer shell, so the 3 Hydrogens donate 3 electrons in total. This gives 8 valence electrons in total. We...

Answered by Matthew N. Chemistry tutor
8200 Views

What is a disproportionation reaction?

A disproportionation reaction is when an element is both oxidised and reduced in the same reaction. You check this by looking at the oxidation state of the element at the begining of the reaction and t...

Answered by Mia V. Chemistry tutor
50795 Views

What is an isomer?

Isomers are molecules which have the same molceular formula but have a different arrangement of atoms in space. This does not include when molecules have been rotated as their arrangment of atoms is st...

Answered by Anna N. Chemistry tutor
4852 Views

What is benzene and describe the 2 models used to explain it's structure. Provide a piece of evidence to show which of these models is incorrect.

Benzene
With a formula of C6H6, the molecule has a cyclic structure due to it's 6 carbon atoms joined in a ring. It is symmetrically planar (flat) with it's 6 h...

Answered by Alexander M. Chemistry tutor
15892 Views

When composing a mechanism in organic chemistry, how do I use curly arrows?

There are a few things to learn about the use of curly arrows. Once you've grasped the basics, though, you'll be able to use them with simplicity and clarity no matter how complicated the mechanism is!...

Answered by Marc L. Chemistry tutor
3511 Views

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